Spark plug



} July 21, 1936. B. H.SAVAGE SPARK PL Filed July 5 1953 11VVENTOR 5, 44 /754/46' BY 53 49 A TTORNE Y Patented Jul 21, 193e SPARK PLUG Basil H. Savage, San Diego, Calif., asaignor to Savage Research Oorporationf San Diego,

Application .Iuly 5, 1933, Serial No. 679,068

4 Claims. (Cl. 123-169) My invention relates to spark plugs, and the objects of my invention are:

First, to provide a spark plug which incorporates an auxiliary chamber communicating i with the combustion'chamber of the cylinder in such a manner that cooled gases are caused to spray on the insulating member and electrodes so that these parts are maintained in a clean condition, thus providing a spark plug which does not readily foul;

Second, to provide a spark plug of this class in which the chamber incorporated in the spark plug is exposed tothe atmosphere and provided with cooling fins so that gases from the cylinder upon being compressed therein are cooled prior to return flow into the combustion chamber;

Fourth, .to provide a spark plug of. this class Seventh, to provide on the whole a novelly constructed spark plug which is durable, efllcient in its actions, and which will not readily deteriorate or get out of order.

With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combination,

and arrangement of parts and portions as will be hereinafter described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of reference thereon which form a part of this application in which:

,Figure 1 is a side elevational view of my spark plug; Fig. 2 is an enlarged partial-sectional partial-elevationalview thereof taken through 2-2 4 of Fig. 1; and Fig. 3 is an enlarged transverse sectional view thereof through 2-3 of Fig. 2.

Similar characters of reference refer to similar parts and portions throughout the several views of the drawing.

50 Body member I, core 2', gasket .3, clamp nut I, electrodes 5 and 6, and shell I constitute the principal parts and portions of my novel spark p I A body member I is provided which is annular 5 in form and arranged with a bore Ia therethrough. One end of the body member is externallythreaded, as indicated by Ib, so as to screw into the conventional spark plug opening of an internal combustion engine. The outer extremity is internally threaded as indicated by 5 Ia, and is provided inwardly of the internally threaded portion with a shoulder Id. The body member receives a'core'2 which is formed of insulated material, and is provided with an enlarged portion 2a intermediate its ends adapted 10 to engage ,the shoulder Id or a gasket 3 resting on the shoulder. The core is engaged from its outer portion by means of a clamp nut 4 which fits thereover and co-acts with the screw threads. Ic, thereby rigidly securing the core in sealed 15 relation within the body member I. From its secured portion the core 2 tapers towards the inner end of the body member so as to be spaced from the-walls of the bore la. The core 2 receives an electrode 5 which extends axially there- 2 through and is provided with a terminal .51: at the outer extremity of the core 2. The inner extremity of the electrode 5 protrudes slightly beyond the inner end of the body member I and co-acts with the second electrode 5 secured to 25 the walls of the body member I and extending into contiguous but spaced relation therewith.

The external portion of the body member at its outer end is polygonal in form, as indicated by Ie, forming a tool receiving portion facilitat- 30 ing the tightening of the clamp nut 4. Immediately inwardly from the tool receiving portion Ie the body member I is provided with an annul'ar flange If. A similar flange I a is provided near the outer extremity of the screw threads lb. 85 The two flange portions I! and la are approximately equal in diameter, and the body member I forms therebetween a cylindrical portion In. The cylindrical portion In is intersected by a plurality of ports I 7' which are directed inward- 40 ly and downwardly until they intersect the bore In, as shown best in Fig. 2. The several ports Ii are directed so that their axes intersect the inner extremity of the core 2.

The flanges If and lg are adapted to receive an annular shell member I. The shell member is constant in section and is welded or otherwise connected in sealed relation with the flanges If and la. The shell thus forms with the cylindrical portion In an annular chamber, designated 'A, which is in commlmication with the flring Operation of these spark plugs is as follows: When the premure in the cylinder is increasing, gases flow through the ports l into the chamber A and are cooled. When the pressure within the cylinder is diminishing, the flow is reversed so that streams of the cooled gases are directed against the inner end of the core and along the electrode 5 thereby maintaining these parts in a relatively cooled condition and preventing the accumulation of carbon deposits. Furthermore,

, apparently due to the slight cushioning eflect be limited to this particular construction, combination, and arrangement, but desire to include in the scope of my invention, the construction, combination, and arrangement substantially as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a spark plug, a body member having an annular recess in its outer sidesurface, sealingv means secured over and surrounding said recess supported on the outer surface of said bodymember for sealing said recess to the exterior,

said body member also having ports communieating between the recess and the interior of the spark plug, said ports constituting the only means of ingress or egress to or from said recess.

2. In a spark plug, a body member having a long narrow channel in its outer side surface, and an annular imperforate sealing member secured over and surrounding said channel for sealing said channel to the exterior of said body member, ports communicating between said channel and the interior of the spark plug, said ports constituting the only means of ingress or egress to or from said channel.

3. In a spark plug, a body member having a long narrow channel in its outer side surface, an annular imperforate sealing member secured over and surrounding said channel for sealing said channel to the exterior of said body member, ports communicating between said channel and the interior of the spark plug, said ports constituting the only means of ingress or egress to or from said channel, and cooling fins protruding outwardly from said annular sealing member.

' 4. In a spark plug, a body member having an enclosed recess therein near its outer side in its outer surface, the outer wall of said recess being imperforate and sealing said recess to the exterior of said body member, said body member also having diagonally disposed ports communieating between the recess and the interior of the of ingress or egress to or from said recess.

BASIL H. SAVAGE. 

